To improve the Photon Detection Efficiency(PDE), quantum efficiency and the dynamic detection range of a Multi-pixel Photon Counter(MPPC),its detection characteristics, especially photon number resolving capability were researched. By taking the MPPC as a photon detecting device and utilizing the Peltier effect and external trigger technology, the temperature of MPPC was controlled down to 15 ℃ and the dark counts of MPPC was reduced to 6.5×10-4 count/pulse.Then,by using the Poisson distribution the output signal of MPPC was fitted in the statistical method.Obtained results indicate that the intensity of laser pulses obeys the Poisson distribution. According to the PDE given in the datasheet, the energy resolution of MPPC was calculated.Furthermore,combined the energy resolution and intensity distribution, the average energy of laser pulses was obtained. The experimental results indicate that the MPPC has the energy resolution about 1.96×10-18 J in 532 nm and the average photon number of laser pulse after attenuation is 1.665 and 4.201, respectively. In conclusion,the MPPC is capable of photon resolving and suit for the ultralow light detection in a large dynamic range.